In this example shows that you are passing JSON through postman and in which all records are converted in LinkedHashmap and In which key id hash value as arraylist so here foreach loop gives ArrayLists one by one object......

1. For-Each Operation
In
Mule

2. The For Each scope splits a collection into
elements and processes them iteratively through
the processors embedded in the scope, then
returns the original message to the flow

4. Http XML Info:
<http:listener-config
name="HTTP_Listener_Configuration"
host="localhost" port="8033"
doc:name="HTTP Listener Configuration" />

5. First LOGGER XML:
<logger message="#[message.payload]"
level="INFO" doc:name="Logger" />

6. Transform XML
<dw:transform-message doc:name="Transform
Message">
<dw:set-payload><![CDATA[%dw 1.0
%output application/java
---
{
id:payload.product.id,
name:payload.product.name,
city:payload.product.city
}]]></dw:set-payload>
</dw:transform-message>

7. 2nd
Logger XML:
<logger message="#[payload.id]" level="INFO"
doc:name="Logger" />

8. Flow Variable XML:
<set-variable variableName="var"
value="#[message.payload.id]"
doc:name="Variable" />

9. ForEach XML:
<foreach collection="#[flowVars.var]"
doc:name="For Each">
<logger
message="#[flowVars.var[flowVars.counter-1]] +
#[flowVars.counter]"
level="INFO" category="## data inside
for each ### " doc:name="Logger" />
</foreach>

10. Input JSON via POSTMAN:
{“product”:[
{
“id”:5,
“name”:”Raj”},
{
“id”:7,
“name”:”Anuj”}]

11. Output: